Join Coast Guard?

Ex-military here and I'll tell you it sounds like you'd be joining for the wrong reasons and that you'd be miserable.

First, if you want to be a pilot you're going to have to be an officer. You _might_ be able to fly a helicopter if you get your 2 year degree but to actually fly a fixed wing plane in the military you'll need a 4 year degree, go through OCS and qualify for being a pilot. If you _really_ want to fly a plane, your best bet would be to start working on a light aircraft license now.

Second, just because you're good in/around water doesnt mean you should join the Coast Guard (or Navy). You should talk to all five branches and find something that fits you. Your MOS is going to be your job for the term of your enlistment (unless you sign up for something crazy like a 6 year term) so find one that you like. Otherwise you may be more miserable in a dead end job while under contract to complete it for X years.

If all you want to do is fly then here's what I suggest:
1) Finish a degree
2) Find a job that you can live off of and have money for
3) Take flight lessons. Any style aircraft will do but preferably one that's the kind you'd like
4) Fly. Fly, fly, flyflyfly. Get your hours in.
5) Decide if you want to make flying your career or if you want to change to something else in your life.

Just remember, life is what happens while we're making plans for our life.

Pilot here since 16. It's always best to get someone else to pay for your flight lessons. You could stick out college and go to OCS and meet all the requirements for a pilot training slot, but unless you want to fly a desk, make sure you can pass the physical stuff first. USAF currently has 2,000 empty pilot slots, and not enough airline guys want to come back in. Over the next few years there will be a lot of retirements which makes it harder to fight future wars.
You could enlist and get the GI Bill benefits, but if I heard right, it does not pay for your Private license which currently costs 6K-12K depending on the vendors. The PP ticket is not considered applicable to future employment because you cannot legally carry earn money with it. The GIB does pay for your Instrument and Commercial but only at approved Part 141 schools.
There are three areas of aviation: Military, Airlines (Commercial Carriers), and General Aviation. There are plenty of fly-for-hire opportunities in the latter; flight instruction, law enforcement, business jets, surveys, patrols, charter, etc. If you ever have any health issues, you should still be able to get the required Second Class medial cert with waivers or SODA's. There are only about 245,000 active pilots in the FAA database now and not all of them are flying. The civilian sector is also experiencing a shortage of comm pilots, and its only going to get worse.
Join aopa.org and eaa.org and read Flying mag every month for the latest info. Good luck.

@Everyone

I wouldn't be joining to fly. I've looked now into all of it already and I know you need a degree to be an officer and you need to be an officer to fly. What I'm saying is if I join and save the money I make and use my GI Bill to get flight lessons and stuff. My passion is actually to scuba dive. I love it and I love everything about it. I know the army, navy, and coast guard all have jobs scuba diving so if I could get into that program then I would be pretty happy diving for any branch. I would also be interested in being a rescue swimmer for the coast guard. I love swimming and I feel like I would really have a purpose saving people's lives. Also the coast guard kind of gets a bonus the other branches don't because of the fact that I would more than likely be stationed somewhere within the US.

apply to be in the airforce academy

Better than going to Iraq or Afghanistan. The USCG does deploy to the middle east in a protective capacity. Finish a few semesters for an advanced pay grade. And get a recruiter's promises in writing. They are friendly but not your friend or ally.

Why not the Airforce if you want to be a pilot